Amid mounting suspense over a possible alliance between the Congress and the Aam Aadmi Party in Delhi for the Lok Sabha elections, Delhi Congress chief Sheila Dikshit clarified that the 'ultimate decision' will be taken by party President Rahul Gandhi. Aam Aadmi Party supremo, Arvind Kejriwal, had earlier accused Congress of helping the BJP by refusing a tie-up, as a 3-cornered contest in Delhi would split the 'anti-BJP vote'.